The EM4324 from EM Microelectronic is a RFID Tag IC with Frequency 860 to 960 MHz, Operating Temperature -20 to 85 Degree C, Read sensitivity -27 to -8 dBm, Storage Temperature -50 to 150 Degree C, Voltage 1.25 to 3.3 V. Tags: Passive, Battery Assisted. More details for EM4324 can be seen below.